Tewskbury police are looking for a man who held up a Tedeschi Food Shop with a large knife early Saturday morning.

Officers responded to the store at 2280 Main St. at 3:20 a.m. for an armed robbery report. The clerk told police that a white man in his 40s showed a knife and took an undisclosed amount of money. The man was described as 5 feet 7 inches and 170 pounds with a white beard. He is believed to have fled in an older model white sedan seen leaving the area.